Hot water boilers for solid fuels (with cooling loop)

nominal power 20 kW

Hot water boiler KTP 20 for combustion of fire wood, short piece wood, fresh saw dust, wet chips and other wet biomass. Another possible alternative fuel is brown and hard coal. The fuels can be mixed. Boilers comply with Class 4 in accordance with the Norm ČSN EN 303 – 5 EKODESIGN

Special construction of combustion chamber enabling double combustion, i.e. about 80% gasification and about 20% common burning out.

Boilers are a welded structure, inner plates 5 mm thick, outer walls 4 mm thick. All walls of the boiler body are doubled, filled with water, including the grate made of heat resistant pipes.

New generation of heating boilers for solid fuel and wood chippers of own design
KTP 20


Nominal output 20 kW
Min. output 12 kW
Boiler width 622 mm
Boiler height 1193 mm
Boiler depth 550 mm
Grate depth 350 mm
Chimney height 1086 mm
Chimney diameter 159 mm
Height of water inlet 293,5 mm
Diameter of water inlet and outlet 2″
Max. diam./length of wood 200/ 330 mm
Volume of combustion chamber 47,9 l
Boiler weight 261 kg
Boiler class in accordance with Norm EN 303-5 4
Efficiency 85,1%
Energy efficiency class C
Energy Efficiency Index (EEI) 79
Seasonal energy efficiency 79 %
Boiler emissions according to Commission Regulation (EU) No. 2015/1189 EKODESIGN
Flow rate of burnt gas – nominal output 146 m³/h
Hydraulic boiler loss 0,4 mbar
Burning time for nominal output 4 h
Size of loading hatch, semicircle – width x height 245×230 mm
Water volume 98 l
Max. operation water overpressure 2 bar
Min. operation water overpressure 0,5 bar
Testing water overpressure 4 bar
Max. operation temperature 90 °C
Specified chimney draught 14 Pa
Wood consumption for nominal output 6,4 kg/h
Temperature of burnt gas for nominal output 265 °C
Consumption of brown coal for nominal capacity 3,8 kg/h
Min. Storage tank 800 l

guarantee for the tightness of boiler body 3 years

  • guarantee for the tightness of boiler body 3 years
  • possibility to burn all kinds of solid fuels
  • possibility to burn wet wood, wet biomass and other solid fuels in manual operation
  • boilers are designed for low chimney draught 10 – 12 Pa
  • boilers include a cooling loop as a protection against overheating
  • the boiler output can be adjusted and its service capacity reduced by 40% without any additional devices
  • the return water can drop up to 40°C because it goes through the pipe grate near the fire place

This boiler KTP 20 with manual loading can be completed with a high quality pellet burner and changed to an automatic boiler KTP 20 PELLET.

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